Betula fontinalis vs birch tree

Betula fontinalis and birch tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Betula fontinalis	Yes	No	No	No
birch tree	Yes	No	No	No

As nouns, birch tree is a hypernym of Betula fontinalis; that is, birch tree is a word with a broader meaning than Betula fontinalis:

Betula fontinalis: birch of western United States resembling the paper birch but having brownish bark
birch tree: any betulaceous tree or shrub of the genus Betula having a thin peeling bark

Other hypernyms of Betula fontinalis include birch.

Betula fontinalis (noun)	birch tree (noun)
birch of western United States resembling the paper birch but having brownish bark	any betulaceous tree or shrub of the genus Betula having a thin peeling bark